v0.62.0

Added

• Idle guests give their file cache back to the host. A VM that read a few gigabytes used
  to hold that memory for good, duplicated in the host's page cache or, on a busy host, its
  swap. A guest that is not under memory pressure now returns the file cache it has stopped
  using and keeps what it is still re-reading — on an 8G dev VM holding 5G of cache, the VMM's
  host footprint fell from 7.7G to 1.3G. vk run --reclaim, a service's x-virtkit.reclaim
  and the executor's [vm] reclaim default to auto and also take off, or a size or share
  of RAM to keep cached.

Full Changelog: v0.61.0...v0.62.0